JEE Main 2019 Physics question
Two sources of sound and produce sound waves of same frequency 660 Hz. A listener is moving from source towards with a constant speed u m/s and he hears 10 beats/s. The velocity of sound is 330 m/s. Then, u equals:
Answer: (D)
Solution
Beat frequency = 2fu/v = 10 ⇒ u = 2.5 m/s.